I dont think any inverts will be safe. You could try a sand sifting goby for your sand

I agree, or try something that burrows in the sand. I would say a queen conch, but they can get up to 14 inches. Look up a sand star, they tend to stay under the sand, but all of these options are not guaranteed.

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I have a bunch of Hermit Crabs and they seem to be fine. Is there any other "Hard" shell crab that might work? How important is a clean up crew? I have never really had one and was always struggling with my tank. Mainly due to inexperience and lack of knowledge. Are there any starfish or would he go for them as well?

for the sand sifting, I would go with the Bullet Goby, AKA Dragon Goby. I had algea on my sand and after getting that fish, algea was gone within about 3 days. And i havent had a problem with dirty sand since. JMO

Will the Dragon Goby eat Cyano? I dont know too many fish/inverts that will. But then again Im still learning a lot. I am down to 6 fish now, 2 O. Clowns 2 Blue Damsels One yellow tail damsel and my puffer. I also picked up 2 turbo snails. Their about 2 inches around. My puffer tries to get them but so far he has been unsuccessfull. I have done PWC ever 3 days, and my cyano is still there. Its not getting any worse but its not going away.

I had the cyano problem. what I ended up doing was using a treatment that my LFS had me do. Very well known establishment and very trusted. I think it was Myracin. But, within 3 days, the cyano was gone. I sucked it off the sand and netted what I could. Shut the skimmer off and carbon filter but kept the sump running. In 3 days did a water change, and started up skimmer and carbon filter, and havent had the problem since. He thinks it might have been the sand. But, it was safe for the fish, inverts etc.

I wouldlike to find the cause of the prolem rather than use a treatment every few months.
So I'll kep trying. Thanks for the advice guys! I'll look into getting the goby. Do you think it will put too much of a bioload on my tank?

How long has your tank been set up? I think reducing the hours your lights are on will help but there is still a lot of nutrients in your water for that algae to grow like it is. Maybe now is a good time to go ahead and add that skimmer. One other thing, I would consider doing a bit larger PWC and for the time being I would do them about twice a week.